fine-grained dolomite
11mineral deposit — Introduction aggregate of a mineral in an unusually high concentration. About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …
12Geology of the Grand Teton area — The geology of the Grand Teton area consists of some of the oldest rocks and one of the youngest mountain ranges in North America. The Teton Range, mostly located in Grand Teton National Park, started to grow some 9 million years ago. An older… …
13Mudrock — Glacial Lake Missoula claystone Red mudrock in the Ragged Reef Formation ( …
14Marble — For other uses, see Marble (disambiguation). Marble …
15Geology of Taiwan — Taiwan is active geologically, showing plate boundary tectonics. The island formed at the junction of the Luzon Volcanic Arc (吕宋岛火山弧) and the Ryukyu Volcanic Arc (琉球火山弧). Subduction changes direction at Taiwan. South of the island, the Philippine …
16Matrix (geology) — Potassium feldspar phenocrysts within a fine grained matrix in a granite porphyry. The matrix or groundmass of rock is the finer grained mass of material in which larger grains, crystals or clasts are embedded. The matrix of an igneous rock… …
17Petrography — is that branch of petrology which focuses on detailed descriptions of rocks. Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. Petrographic… …
18calcite — calcitic /kal sit ik/, adj. /kal suyt/, n. one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc spar. [1840 50; CALC + ITE1] * * * Most… …
19Sedimentary rock — Middle Triassic marginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwestern Utah, USA Sedimentary rock are types of rock that are formed by the deposition of material at the Earth s surface and within… …
20Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …
